/* mainframe-mcp-server — GitHub Pages site */

/* Dark theme (default) */
:root,
[data-theme="dark"] {
  --bg: #0a0e14;
  --bg-elevated: #111820;
  --bg-card: #151d28;
  --bg-code: #0d1117;
  --border: #243044;
  --text: #e6edf5;
  --text-muted: #8b9cb3;
  --accent: #22c55e;
  --accent-dim: #166534;
  --accent-blue: #38bdf8;
  --accent-purple: #a78bfa;
  --warning: #fbbf24;
  --header-bg: rgba(10, 14, 20, 0.85);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --code-text: #c9d1d9;
  --highlight-col: rgba(34, 197, 94, 0.06);
  --callout-accent: rgba(34, 197, 94, 0.08);
  --callout-warning: rgba(251, 191, 36, 0.08);
  --callout-info: rgba(56, 189, 248, 0.08);
  --badge-green-border: #166534;
  --badge-blue-border: #1e4a6e;
  --badge-purple-border: #4c3d7a;
  --btn-primary-text: #0a0e14;
  --hero-gradient-1: rgba(34, 197, 94, 0.12);
  --hero-gradient-2: rgba(56, 189, 248, 0.08);
}

/* Light theme */
[data-theme="light"] {
  --bg: #f4f7fb;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-code: #f1f5f9;
  --border: #d0dae8;
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #15803d;
  --accent-dim: #dcfce7;
  --accent-blue: #0369a1;
  --accent-purple: #6d28d9;
  --warning: #b45309;
  --header-bg: rgba(244, 247, 251, 0.92);
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
  --code-text: #1e293b;
  --highlight-col: rgba(21, 128, 61, 0.08);
  --callout-accent: rgba(21, 128, 61, 0.1);
  --callout-warning: rgba(180, 83, 9, 0.1);
  --callout-info: rgba(3, 105, 161, 0.1);
  --badge-green-border: #86efac;
  --badge-blue-border: #7dd3fc;
  --badge-purple-border: #c4b5fd;
  --btn-primary-text: #ffffff;
  --hero-gradient-1: rgba(21, 128, 61, 0.08);
  --hero-gradient-2: rgba(3, 105, 161, 0.06);
}

:root {
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'Consolas', 'IBM Plex Mono', monospace;
  --radius: 10px;
  --max-width: 1100px;
  color-scheme: light dark;
}

[data-theme="dark"] {
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--hero-gradient-1), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, var(--hero-gradient-2), transparent);
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

body.nav-open {
  overflow: hidden;
  touch-action: none;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code,
pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

img {
  max-width: 100%;
  height: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.header-bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
  z-index: 202;
}

.logo-text {
  min-width: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex: 1;
  justify-content: flex-end;
}

.nav-backdrop {
  display: none;
}

.nav-menu-toggle {
  display: none;
  position: relative;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
  z-index: 203;
  -webkit-tap-highlight-color: transparent;
}

.nav-menu-toggle {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
}

.nav-menu-toggle svg {
  grid-area: 1 / 1;
}

.nav-menu-toggle .icon-close {
  display: none;
}

body.nav-open .nav-menu-toggle .icon-menu {
  display: none;
}

body.nav-open .nav-menu-toggle .icon-close {
  display: block;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-blue));
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--btn-primary-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.theme-toggle svg {
  grid-area: 1 / 1;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(30deg) scale(0.8);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(-30deg) scale(0.8);
}

[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.9rem;
  background: var(--accent);
  color: var(--btn-primary-text) !important;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none !important;
}

.nav-cta:hover {
  filter: brightness(1.08);
}

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
}

.badge-green { border-color: var(--badge-green-border); color: var(--accent); }
.badge-blue { border-color: var(--badge-blue-border); color: var(--accent-blue); }
.badge-purple { border-color: var(--badge-purple-border); color: var(--accent-purple); }

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero h1 span {
  background: linear-gradient(90deg, var(--accent), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 2rem;
}

.hero-banner {
  width: 100%;
  max-width: 900px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none !important;
  border: 1px solid transparent;
  transition: transform 0.15s, background 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--btn-primary-text);
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

section {
  margin-bottom: 4rem;
  scroll-margin-top: 5rem;
}

section h2 {
  font-size: 1.65rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

section > p.section-intro {
  color: var(--text-muted);
  margin: 0.75rem 0 1.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--accent-blue);
}

.card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.table-wrap table {
  min-width: 520px;
}

.table-scroll-hint {
  display: none;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--bg-elevated);
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

td:first-child {
  font-weight: 500;
  color: var(--text-muted);
}

.highlight-col {
  background: var(--highlight-col);
}

.tool-category {
  margin-bottom: 2rem;
}

.tool-category h3 {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tool-category h3::before {
  content: '';
  width: 4px;
  height: 1.1rem;
  background: var(--accent);
  border-radius: 2px;
}

.tool-list {
  display: grid;
  gap: 0.5rem;
}

.tool-item {
  display: grid;
  grid-template-columns: minmax(180px, 220px) 1fr;
  gap: 1rem;
  padding: 0.65rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
}

.tool-item code {
  color: var(--accent-purple);
  font-weight: 500;
}

.tool-item span {
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .tool-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
}

.code-block pre {
  margin: 0;
  color: var(--code-text);
  line-height: 1.5;
}

.code-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 3rem;
  margin-bottom: 1.5rem;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.steps li strong {
  display: block;
  margin-bottom: 0.35rem;
}

.steps li p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.callout {
  border-left: 4px solid var(--accent);
  background: var(--callout-accent);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.callout-warning {
  border-left-color: var(--warning);
  background: var(--callout-warning);
}

.callout-info {
  border-left-color: var(--accent-blue);
  background: var(--callout-info);
}

.example {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.example-user {
  color: var(--accent-blue);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.example-user::before {
  content: 'You: ';
  font-weight: 700;
}

.example-result {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: pre-wrap;
  margin: 0;
  padding: 0.75rem;
  background: var(--bg-code);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.site-footer a {
  margin: 0 0.5rem;
}

.footer-links {
  margin-bottom: 0.75rem;
}

/* ---- Mobile & tablet ---- */
@media (max-width: 900px) {
  .nav-menu-toggle {
    display: grid;
  }

  .header-bar {
    flex-wrap: nowrap;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    padding: 0;
    cursor: pointer;
  }

  .nav-backdrop[hidden] {
    display: none !important;
  }

  .nav-menu {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--nav-menu-top, 3.75rem);
    z-index: 201;
    flex: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    padding: 0 1.25rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    pointer-events: none;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }

  body.nav-open .nav-menu {
    max-height: calc(100vh - var(--nav-menu-top, 3.75rem));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.75rem 1.25rem 1.5rem;
    pointer-events: auto;
  }

  .nav-links {
    flex-direction: column;
    gap: 0;
    width: 100%;
    margin: 0 0 1rem;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.9rem 0.25rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
    -webkit-tap-highlight-color: transparent;
  }

  .nav-links a:active {
    color: var(--accent);
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 0.25rem;
  }

  .nav-cta {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 0.75rem 1rem;
    text-align: center;
  }

  .theme-toggle {
    width: 2.75rem;
    height: 2.75rem;
    flex-shrink: 0;
  }

  section {
    scroll-margin-top: 4.5rem;
  }

  .table-scroll-hint {
    display: block;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-bar {
    padding: 0.65rem 1rem;
  }

  .logo {
    font-size: 0.95rem;
    max-width: calc(100% - 3.5rem);
  }

  .logo-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero {
    padding: 2rem 1rem 1.5rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
    width: 100%;
  }

  main {
    padding: 0 1rem 3rem;
  }

  section h2 {
    font-size: 1.4rem;
  }

  section {
    margin-bottom: 3rem;
  }

  th,
  td {
    padding: 0.6rem 0.75rem;
    font-size: 0.82rem;
  }

  .code-block {
    padding: 0.85rem 1rem;
    font-size: 0.78rem;
  }

  .code-block pre {
    font-size: 0.78rem;
  }

  .steps li {
    padding-left: 2.75rem;
  }

  .callout {
    padding: 0.85rem 1rem;
    font-size: 0.88rem;
  }

  .site-footer {
    padding: 1.5rem 1rem;
    font-size: 0.82rem;
  }

  .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1rem;
  }

  .footer-links a {
    margin: 0;
  }
}

@media (max-width: 380px) {
  .logo-text {
    max-width: 9rem;
  }

  .hero-badges {
    gap: 0.35rem;
  }

  .badge {
    font-size: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}